Pad

Video Single output Transform

Pad the input video.

FFmpeg filter: pad — the official reference.

Add it to a graph. The explicit form works for every filter — bind it to its input and read the result from outputs():

$node   = $video->addFilter(new Pad(…));
$result = $node->outputs()[0];

Shorthand. Single-output filters can skip the node — apply() returns the result stream directly:

$result = $video->apply(new Pad(…));

When to use it

TODO — when this filter shines: what it’s the right tool for, what to reach for instead when it isn’t, and how it composes with neighbouring filters.

How to use it

TODO — prose: how the filter actually works and what its key parameters mean (the explanation FFmpeg’s terse option help omits).

Examples

TODO — runnable PHP, with the equivalent ffmpeg CLI alongside.

Gotchas

TODO

See also

TODO

Parameters

Parameter	Type	Default	Range / values	Description
width	int|float|string	iw	expression	set the pad area width expression
height	int|float|string	ih	expression	set the pad area height expression
x	int|float|string	0	expression	set the x offset expression for the input image position
y	int|float|string	0	expression	set the y offset expression for the input image position
color	string	black	—	set the color of the padded area border
eval	PadEval	init	init, frame	specify when to evaluate expressions
aspect	string	—	—	pad to fit an aspect instead of a resolution

FFmpeg also names these options (use the parameter shown above): w → width, h → height.

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Maps to FFmpeg’s pad filter. Verified against ffmpeg n7.1.1.